Learn basics of Dart programming language with code examples and explainations.

Photo of Hyacinth macaw by Roi Dimor on Unsplash Types of Pointers in C / C++1. Null PointerIt is a pointer pointing to nothing. NULL pointer points to the base address of the segment. -EXAMPLE- c 1int * ptr = (int) * 0; 2float * fptr = (float) * 0; 3double * dptr = (double) * 0; 4char * chptr = (char) * 0; Other ways of initializing NULL pointer c 1int * ptr = NULL; 2char * chptr = '\0'; NULL also means 0 in macro c 1#define NULL 0 2. Dangling PointerA pointer pointing to the memory address of any variable (or object) which has been deleted from memory. When a pointer points to a deleted memory address, the pointer is called as a dangling pointer.

Instructions Things You’ll Need Proficiency in C++ C++ compiler Debugger and other investigative software tools Part 1Understand the operator basics. The C++ operator new allocates heap memory. The delete operator frees heap memory. For every new, you should use a delete so that you free the same memory you allocated: cpp 1char* str = new char [30]; // Allocate 30 bytes to house a string. 2delete [] str; // Clear those 30 bytes and make str point nowhere. Part 2Reallocate memory only if you’ve deleted. In the code below, str acquires a new address with the second allocation. The first address is lost irretrievably, and so are the 30 bytes that it pointed to. Now they’re impossible to free, and you have a memory leak:

Photo by NASA on Unsplash If you want to learn bash bash scripting please read this article. Learn complete Linux bash (shell) scripting in one article Operators help us perform various types of operations such as addition, multiplication etc. There are following types of operators present in bash: Arithmetic, Relational, Boolean, File Test, String Test 1. Arithmetic OperatorsAll the arithmetic operators present in bash are discussed below with examples. These operators work with integers.

If you want to get Linux environment in your Windows system there are some solutions that provide the opportunity. For example MYSYS, CYGWIN and a Virtual Machine (If you want complete linux machine) or Multiple Boot. But some of them aren’t much powerful and some are resources hungry like Virtual Machine. So, the solution is WSL (Windows Subsystem for Linux). You can learn how to setup WSL from here.